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1 : : // Copyright (c) 2009-2010 Satoshi Nakamoto
2 : : // Copyright (c) 2009-present The Bitcoin Core developers
3 : : // Distributed under the MIT software license, see the accompanying
4 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
5 : :
6 : : #ifndef BITCOIN_UTIL_TIME_H
7 : : #define BITCOIN_UTIL_TIME_H
8 : :
9 : : #include <chrono> // IWYU pragma: export
10 : : #include <cstdint>
11 : : #include <optional>
12 : : #include <string>
13 : : #include <string_view>
14 : :
15 : : using namespace std::chrono_literals;
16 : :
17 : : /** Mockable clock in the context of tests, otherwise the system clock */
18 : : struct NodeClock : public std::chrono::system_clock {
19 : : using time_point = std::chrono::time_point<NodeClock>;
20 : : /** Return current system time or mocked time, if set */
21 : : static time_point now() noexcept;
22 : : static std::time_t to_time_t(const time_point&) = delete; // unused
23 : : static time_point from_time_t(std::time_t) = delete; // unused
24 : : };
25 : : using NodeSeconds = std::chrono::time_point<NodeClock, std::chrono::seconds>;
26 : :
27 : : using SteadyClock = std::chrono::steady_clock;
28 : : using SteadySeconds = std::chrono::time_point<std::chrono::steady_clock, std::chrono::seconds>;
29 : : using SteadyMilliseconds = std::chrono::time_point<std::chrono::steady_clock, std::chrono::milliseconds>;
30 : : using SteadyMicroseconds = std::chrono::time_point<std::chrono::steady_clock, std::chrono::microseconds>;
31 : :
32 : : using SystemClock = std::chrono::system_clock;
33 : :
34 : : /**
35 : : * Version of SteadyClock that is mockable in the context of tests (set the
36 : : * current value with SetMockTime), otherwise the system steady clock.
37 : : */
38 : : struct MockableSteadyClock : public std::chrono::steady_clock {
39 : : using time_point = std::chrono::time_point<MockableSteadyClock>;
40 : :
41 : : static constexpr std::chrono::milliseconds INITIAL_MOCK_TIME{1};
42 : :
43 : : /** Return current system time or mocked time, if set */
44 : : static time_point now() noexcept;
45 : : static std::time_t to_time_t(const time_point&) = delete; // unused
46 : : static time_point from_time_t(std::time_t) = delete; // unused
47 : :
48 : : /** Set mock time for testing.
49 : : * When mocking the steady clock, start at INITIAL_MOCK_TIME and add durations to elapse time as necessary
50 : : * for testing.
51 : : * To stop mocking, call ClearMockTime().
52 : : */
53 : : static void SetMockTime(std::chrono::milliseconds mock_time_in);
54 : :
55 : : /** Clear mock time, go back to system steady clock. */
56 : : static void ClearMockTime();
57 : : };
58 : :
59 : : void UninterruptibleSleep(const std::chrono::microseconds& n);
60 : :
61 : : /**
62 : : * Helper to count the seconds of a duration/time_point.
63 : : *
64 : : * All durations/time_points should be using std::chrono and calling this should generally
65 : : * be avoided in code. Though, it is still preferred to an inline t.count() to
66 : : * protect against a reliance on the exact type of t.
67 : : *
68 : : * This helper is used to convert durations/time_points before passing them over an
69 : : * interface that doesn't support std::chrono (e.g. RPC, debug log, or the GUI)
70 : : */
71 : : template <typename Dur1, typename Dur2>
72 [ + - + - ]: 16703114 : constexpr auto Ticks(Dur2 d)
[ + - ]
73 : : {
74 [ + - + - ]: 16703114 : return std::chrono::duration_cast<Dur1>(d).count();
[ + - ]
75 : : }
76 : : template <typename Duration, typename Timepoint>
77 : 5760843 : constexpr auto TicksSinceEpoch(Timepoint t)
78 : : {
79 : 5760843 : return Ticks<Duration>(t.time_since_epoch());
80 : : }
81 [ + - + - ]: 1031594 : constexpr int64_t count_seconds(std::chrono::seconds t) { return t.count(); }
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82 [ + - ]: 443957 : constexpr int64_t count_milliseconds(std::chrono::milliseconds t) { return t.count(); }
83 [ + - ]: 1 : constexpr int64_t count_microseconds(std::chrono::microseconds t) { return t.count(); }
84 : :
85 : : using HoursDouble = std::chrono::duration<double, std::chrono::hours::period>;
86 : : using SecondsDouble = std::chrono::duration<double, std::chrono::seconds::period>;
87 : : using MillisecondsDouble = std::chrono::duration<double, std::chrono::milliseconds::period>;
88 : :
89 : : /**
90 : : * DEPRECATED
91 : : * Use either ClockType::now() or Now<TimePointType>() if a cast is needed.
92 : : * ClockType is
93 : : * - SteadyClock/std::chrono::steady_clock for steady time
94 : : * - SystemClock/std::chrono::system_clock for system time
95 : : * - NodeClock for mockable system time
96 : : */
97 : : int64_t GetTime();
98 : :
99 : : /**
100 : : * DEPRECATED
101 : : * Use SetMockTime with chrono type
102 : : *
103 : : * @param[in] nMockTimeIn Time in seconds.
104 : : */
105 : : void SetMockTime(int64_t nMockTimeIn);
106 : :
107 : : /** For testing. Set e.g. with the setmocktime rpc, or -mocktime argument */
108 : : void SetMockTime(std::chrono::seconds mock_time_in);
109 : :
110 : : /** For testing */
111 : : std::chrono::seconds GetMockTime();
112 : :
113 : : /**
114 : : * Return the current time point cast to the given precision. Only use this
115 : : * when an exact precision is needed, otherwise use T::clock::now() directly.
116 : : */
117 : : template <typename T>
118 : 3001918 : T Now()
119 : : {
120 : 3001918 : return std::chrono::time_point_cast<typename T::duration>(T::clock::now());
121 : : }
122 : : /** DEPRECATED, see GetTime */
123 : : template <typename T>
124 : 2809238 : T GetTime()
125 : : {
126 : 2809238 : return Now<std::chrono::time_point<NodeClock, T>>().time_since_epoch();
127 : : }
128 : :
129 : : /**
130 : : * ISO 8601 formatting is preferred. Use the FormatISO8601{DateTime,Date}
131 : : * helper functions if possible.
132 : : */
133 : : std::string FormatISO8601DateTime(int64_t nTime);
134 : : std::string FormatISO8601Date(int64_t nTime);
135 : : std::optional<int64_t> ParseISO8601DateTime(std::string_view str);
136 : :
137 : : /**
138 : : * Convert milliseconds to a struct timeval for e.g. select.
139 : : */
140 : : struct timeval MillisToTimeval(int64_t nTimeout);
141 : :
142 : : /**
143 : : * Convert milliseconds to a struct timeval for e.g. select.
144 : : */
145 : : struct timeval MillisToTimeval(std::chrono::milliseconds ms);
146 : :
147 : : #endif // BITCOIN_UTIL_TIME_H
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